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Dynamo version

ALL up to 2.17

Operating system

Windows 10

What did you do?

Loading a dll into Dynamo Sandbox or Dynamo Revit.
The dynamo load library function will cause 'CompilerInternalException' error message if a method like this is present

myClass.AnyMethod(myCustomEnumType parameter = myCustomEnumType .None);
because "parameter" provides a default value of a custom type.
It looks like all dynamo versions are affected (I found in 2.12.0 but it appears also inside current 'main' code).

This is caused by the Dynamo code parsing the dll to generate nodes:

Engine\ProtoCore\FFI\CLRDLLModule
Method ParseArgumentSignature(MethodBase method)

This is caused by the Dynamo code parsing the dll to generate nodes:

Engine\ProtoCore\FFI\CLRDLLModule
Method ParseArgumentSignature(MethodBase method)
..
foreach (var parameter in parameter)
{
if (parameter.IsOptional
{
var defaultValue = = parameter.DefaultValue;
if (defaultValue != null)
{

var rhs = AstFactory.BuildPrimitiveNodeFromObject(defaultValue); // EXCEPTION

}
}
}

which calls

Engine/ProtoCore/Parser/AssociativeAST.cs
Method BuildPrimitiveNodeFromObject(object value)
where value must be of type short, int, long, float, double, string, boolan - otherwise it will throw exception.

What did you expect to see?

No error on loading a dll.

Also: If error a more meaningful error message would be helpful.
Currently: 'Exception of type 'ProtoCore.Exceptions.CompilerInternalException' was thrown

Including dll name + class name + method name (or at least dll name) would be extreme helpful

quite often errors can be caused due a dependency.. (version conflict for example). Which dependency?

What did you see instead?

A dialog 'Failed to load library'.